The first is to start with mathematical thought: the combination of numbers and shapes. Then we can talk about teaching and students' learning methods. Junior high school is more about teachers explaining, while senior high school is more about students thinking independently and improving themselves.

From some knowledge points, we can make some improvements, specifically, we can take out textbooks for junior high school and senior high school. For example: junior high school plane geometry, senior high school solid geometry and so on.

I hope I can help you!